Ring pessary



FIG. 1 is a front view of a ring pessary showing my new design;

FIG. 2 is a side view of a ring pessary of FIG. 1;

FIG. 3 is a top view of a ring pessary of FIG. 1; and,

FIG. 4 is a front and left side perspective view of a ring pessary of FIG. 1. 

CLAIM The ornamental design for a ring pessary, as shown and described. 